Durable feat does a 20 con wizard regain a min 10 or 15 hp w/ feat?

@JasonBrock20There has been confusion over the durable feat and the meaning of “roll” does a 20 con wizard regain a min 10 or 15 hp w/ feat? 10 – roll means die roll + mods. Anything that affects only the number yielded by the die will say so specifically.